14. A Clockwork Orange (1971)
Using the 'A' of the title as a door way for the main character to reach out and point his knife at you suggests that the violence depicted within is much closer than you think.
13. Dr. Strangelove (1964)
An entry truly deserving of place on this list due to the incredible connotations that still apply today. It's simple, funny and completely relevant.
12. Cold Souls (2009)
Using a babushka doll effect on a man's head takes some serious imagination and results in a poster that far outweighs its film.